Solar panels are a brilliant investment if you’re looking to slash your energy bills, cut your carbon footprint, and gain some much-needed independence from rising grid prices.
Solar panels can cut electricity bills, but paying several thousand pounds upfront isn’t realistic for every household.
Solar finance lets you spread the cost through installer finance, personal loans, mortgage borrowing or other credit arrangements.
The key is to compare the total amount repayable, not just the monthly payment.
Key Takeaways:
- Paying cash usually gives the lowest total cost.
- Installer finance is convenient, but not always cheapest.
- Personal loans let you separate your installer choice from your lender.
- Financing doesn’t normally stop you claiming Smart Export Guarantee payments.
- The government is rolling out a new Warm Homes Loan Scheme designed to support low- and zero-interest finance for measures including solar and batteries.
- Scotland no longer offers new Home Energy Scotland funding for standalone solar PV.
- If an installer arranges finance, check the lender or broker on the FCA register.
Pro tip: Avoid upsells and confusing packages—choose a provider with a clear, fixed-price quote that won’t change. Heatable, a Which?-approved solar installer, offers transparent pricing with no surprises.
What Is Solar Panel Finance?
Solar finance allows you to install panels now and repay the cost over time.
Common options include:
- Installer finance
- Personal loans
- Secured home-improvement loans
- Mortgage borrowing
- Solar leases or PPAs
- Emerging government-backed finance
In most standard loan arrangements, you still own the panels and can receive the normal benefits of solar ownership.
Related solar guides:
- How many solar panels do you need?
- Smart Export Guarantee
- Can you install solar panels in a conservation area?
- Best 4kw solar system with battery storage
- Sunshine hours map UK
- Best Solar Panels
- Solar panel output calculator
1. Paying Cash
Best for: Homeowners who can comfortably afford the upfront cost.
Pros
- No interest
- Full ownership immediately
- Lowest total purchase cost
- No monthly repayments
Cons
- Large upfront expense
- Uses savings that could remain invested or available for emergencies
If you have sufficient cash reserves, outright purchase is the benchmark every finance option should be compared against.
See our solar panel cost guide for current system prices.
Check out our video on selecting solar panels in the UK:
2. Installer Finance
Many solar installers offer finance through third-party lenders.
This can include:
- Low deposits
- Fixed monthly repayments
- Promotional 0% periods
- Deferred-payment offers
Pros
- Convenient
- Low upfront cost
- Usually retains system ownership
- Simple quote-and-finance process
Cons
- Interest can significantly increase total cost
- Longer terms can disguise expensive finance behind low monthly payments
- Installer finance may not be the cheapest borrowing available
Always ask for both:
Cash price: £7,000
Total financed cost: £9,200
The £2,200 difference is part of the real cost of your solar system.
3. Personal Loans
A personal loan lets you arrange finance independently and pay the installer as a cash customer.
Pros
- You can shop around for the best rate
- You retain ownership
- No property security for normal unsecured loans
Cons
- Requires a credit application
- Rates vary by borrower
- Interest reduces overall solar returns
We wouldn’t quote a fixed “typical APR” because rates change constantly.
Compare the actual APR and total repayment available to you.
4. Mortgage or Secured Borrowing
You may also be able to fund solar through:
- A mortgage further advance
- Remortgaging
- A secured home-improvement loan
Rates may be lower than unsecured borrowing, but the repayment term can be much longer.
That can mean paying more interest overall.
With secured borrowing, your home may also be at risk if repayments aren’t maintained.
For a relatively modest solar installation, we’d compare unsecured options carefully before securing the debt against your property.
5. Warm Homes Loan Scheme
The government’s new Warm Homes Loan Scheme is intended to support low- and zero-interest consumer finance for measures including:
- Solar panels
- Battery storage
- Heat pumps
- Other home-energy upgrades
The government launched the first lender phase in 2026 with £300 million of support.
However, don’t assume every homeowner can already apply directly for a 0% government solar loan.
The scheme is still being rolled out through participating lenders.
6. Solar Leasing and PPAs
Solar leasing and Power Purchase Agreements are much less common in the UK residential market than conventional ownership.
With a lease, a third party owns the system and you usually pay to use it.
With a PPA, you purchase the electricity generated under a long-term agreement.
Pros
- Little or no upfront capital
- Maintenance may be handled by the provider
Cons
- You don’t own the panels
- Long contracts
- Can complicate selling or remortgaging
- Export income depends on the contract
Before signing, establish:
- What are the exit charges?
- Who owns the panels?
- Who receives SEG payments?
- What happens if you sell the property?
- Can you buy the system later?
Can You Claim SEG With Financed Solar Panels?
Usually, yes.
Using ordinary credit to buy the system doesn’t inherently prevent Smart Export Guarantee eligibility.
Ofgem allows eligible generators to receive payments for metered electricity exported to the grid. (ofgem.gov.uk)
With leases or third-party ownership, check who owns the export rights.
Compare current Smart Export Guarantee rates before choosing a supplier.
Solar Finance Comparison
| Option | Upfront Cost | Ownership | Main advantage | Main drawback |
| Cash Purchase | High | You | Lowest total cost | Large upfront spend |
| Solar Loan | Low/Medium | You | Shop around independently | May be expensive |
| Installer Finance | Low | You | Convenient | Interest |
| Lease /PPA | Low | You | Little upfront spend | Long repayment term |
| Mortgage Top-Up | Low/Medium | You | Potentially lower rate | No ownership |
Beware of “Your Savings Pay the Loan”
This sales pitch should be treated cautiously.
If your finance payment is £100 per month but solar saves you £60, the panels aren’t “paying for themselves”.
You’re receiving:
£60 of energy benefit + £40 of additional monthly expenditure.
That may still be worthwhile, but it should be described accurately.
Ask what assumptions the salesperson has used for:
- Electricity prices
- Annual generation
- Self-consumption
- SEG income
- Battery savings
Check the FCA Register
If an installer arranges credit, verify the lender or broker on the FCA Financial Services Register.
A solar company might be directly authorised or operate as an appointed representative of another authorised firm.
Check:
- Legal company name
- FCA reference number
- Authorisation status
- Finance permissions
Questions to Ask Before Financing Solar
Before signing, check:
- What is the cash price?
- What is the APR?
- What is the total amount repayable?
- How long is the term?
- Can I repay early?
- Are there fees?
- Who is the lender?
- Do I own the panels immediately?
- Who receives SEG income?
- What happens if I sell the house?
Final Verdict
If you can comfortably afford the system, cash usually gives the best financial return.
If you need finance, compare:
- Independent personal loans
- Installer finance
- Emerging Warm Homes Loan Scheme products
- Mortgage or secured borrowing only where the numbers genuinely justify it
The main rule is simple:
Don’t choose solar finance because the monthly payment looks affordable. Choose it because the total financed cost still makes the solar investment worthwhile.
Before financing anything, work out the right system size using our guide to how many solar panels you need and compare the underlying system price with our solar panel cost guide.
Sources:
💷 Learn more about finance, costs & tariffs:
- Why is electricity more expensive than gas?
- Solar panel finance
- Solar panel costs
- Solar panel cost calculator
- VAT on solar panels
- Smart Export Guarantee rates
- Feed-in tariff
- Average monthly electric bill with solar
- British Gas EV tariff
- Best EV tariffs UK
- Rent a roof
- Free solar panels
- Leasing solar panels
